Table 1. Optimizations of the CM Reaction of Sulfonamide 3a and Alkene 2a.

entry	solvent	catalyst	GC conversiona (%)
1	DCM	1a	76
2	DCM	1b	92
3	DCM	1c	89
4	toluene	1c	81
5	diethyl ether	1c	87
6	DCM	1d	57

^aTetradecane was used as an internal standard.